As hard as it's been to come to this decision, I am at peace with it. I have no regrets. I was not supposed to be here in the first place, remember? Not many people believed in my talent and my abilities, yet I found a way to persevere, to prove them (and sometimes myself!) wrong.

Oh, absolutely. I think most overachievers are driven, not so much by the pursuit of success, but by the fear of failure. Unless failure gets very close and very nearby that fear doesn’t reach profound levels, but it drives us. It drives me to work very hard.

I would try to write my war story, whether it was interesting or not, and try to make something out of it. I describe that process a little in the beginning of Slaughterhouse Five; I saw it as starring John Wayne and Frank Sinatra. Finally, a girl called Mary O’Hare, the wife of a friend of mine who’d been there with me, said, “You were just children then. It’s not fair to pretend that you were men like Wayne and Sinatra, and it’s not fair to future generations, because you’re going to make war look good.” That was a very important clue to me.

But after one year of medical school I fled. I realized I would be a very unhappy doctor and I really did not want to be responsible for the inadvertent death of my patients. Leaving medical school was a very unusual decision, especially in Nigeria where it is very difficult to get into medical school. Later, people told me that it had been very courageous of me, but I did not feel courageous at all. What I felt then was not courage but a desire to make an effort. To try.

I begin each morning, I do every single morning exactly the same way, I begin each morning by doing my highest priority work first. I have a very clear priority list and I start from the highest priority work first. Before I even get to work, my day is already a success. I've already completed my most important work and can dedicate my day to helping others.

Of all of the things that I value most about my abilities, intelligence is not top of that list. My ability to endure pain and suffering, my ability to work on something for a very, very long period of time, my ability to handle setbacks and see the opportunity just around the corner I consider to be my superpowers, and I hope they're yours.